WO2015029660A1 - 穿孔工具 - Google Patents

穿孔工具 Download PDF

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Publication number
WO2015029660A1
WO2015029660A1 PCT/JP2014/069710 JP2014069710W WO2015029660A1 WO 2015029660 A1 WO2015029660 A1 WO 2015029660A1 JP 2014069710 W JP2014069710 W JP 2014069710W WO 2015029660 A1 WO2015029660 A1 WO 2015029660A1
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WO
WIPO (PCT)
Prior art keywords
rotation
mode
motor
rotational
drilling tool
Prior art date
Application number
PCT/JP2014/069710
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
西河　智雅
吉水　智海
高野　信宏
Original Assignee
日立工機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立工機株式会社 filed Critical 日立工機株式会社
Priority to US14/915,388 priority Critical patent/US20160207187A1/en
Priority to EP14839316.8A priority patent/EP3040164A4/de
Priority to JP2015534092A priority patent/JPWO2015029660A1/ja
Priority to CN201480041729.1A priority patent/CN105408067A/zh
Publication of WO2015029660A1 publication Critical patent/WO2015029660A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D16/006—Mode changers; Mechanisms connected thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D16/00—Portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2211/00—Details of portable percussive tools with electromotor or other motor drive
    • B25D2211/06—Means for driving the impulse member
    • B25D2211/068—Crank-actuated impulse-driving mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0015—Tools having a percussion-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0023—Tools having a percussion-and-rotation mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0007—Details of percussion or rotation modes
    • B25D2216/0038—Tools having a rotation-only mode
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0084—Mode-changing mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2216/00—Details of portable percussive machines with superimposed rotation, the rotational movement of the output shaft of a motor being modified to generate axial impacts on the tool bit
    • B25D2216/0084—Mode-changing mechanisms
    • B25D2216/0092—Tool comprising two or more collaborating mode-changing mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/035—Bleeding holes, e.g. in piston guide-sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/091—Electrically-powered tool components
    • B25D2250/095—Electric motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/141—Magnetic parts used in percussive tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/165—Overload clutches, torque limiters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
    • B25D2250/221—Sensors

Definitions

  • the present invention relates to a drilling tool, and more particularly, to a drilling tool having three modes of a rotation mode, a hitting mode, and a rotary hitting mode.
  • the drilling tool is detachably provided with a tip tool, and a drilling operation is performed on a processing member such as concrete or stone by attaching a tip tool such as a drill.
  • a tip tool such as a drill.
  • an object of this invention is to provide the drilling tool which can pull out a front-end tool from a process member easily.
  • the present invention includes a housing, a motor disposed in the housing and capable of rotating in both directions, and a rotational motion transmitting unit that transmits the rotational force of the motor to the tip tool.
  • the drilling tool has a forward / reverse mode that repeats forward and reverse rotations of the motor, and the rotational motion transmission unit is provided on a rotating member that is rotated by the motor, and the rotating member.
  • a drilling tool comprising: an abutting portion that rotates integrally with the rotating member; and an abutted portion that is rotationally driven by abutting against the corresponding contact portion during normal rotation and reverse rotation of the motor. Is provided. *
  • the tip tool when the forward / reverse mode is set, the tip tool repeats in the forward direction and the reverse direction. Therefore, even if the tip tool and the workpiece are temporarily locked (caulking), the forward / reverse mode is set. By setting to, the tip tool can be easily pulled out from the workpiece. Thereby, workability
  • the contact portion and the contacted portion are at least one of a rotation direction of the rotation member when the motor is rotated forward and a rotation direction of the rotation member when the motor is reversed.
  • the rotating members are preferably spaced apart from each other in the circumferential direction.
  • the forward / reverse mode is set when the tip tool and the machining member are temporarily locked. Even when the motor is driven, the drilling tool is not swung around the tip tool. That is, even if the rotation of the motor bounces back as a reaction force on the entire drilling tool because the tip tool is in the locked state, there is a rotation backlash between the motor and the tip tool. The force can be reduced. Thereby, a tip tool can be easily extracted from a processing member, and workability
  • the rotational movement transmission unit includes a reduction unit that decelerates the rotation of the motor and transmits the rotation to the rotation member.
  • the motor further includes a reciprocating motion conversion section that includes a reciprocating member that converts the rotational force of the motor into a reciprocating motion and that strikes the tip tool, and a cylinder that houses the reciprocating member.
  • the abutting portion is provided on the outer side in the radial direction of the cylinder, and the abutted portion is movable in the axial direction of the cylinder, and transmits rotational driving force to the cylinder by moving in the axial direction. It is preferable to block. *
  • a trigger for switching power supply to the motor a switch for switching the operation mode of the drilling tool to a forward / reverse mode; a striking mode in which only the striking force is transmitted to the tip tool by the reciprocating motion converter;
  • a switching dial for switching between a rotational mode in which only the rotational force is transmitted to the tip tool by the rotational motion transmission unit and a rotational impact mode in which the impact force and the rotational force are transmitted to the tip tool; It is preferable that the motor operates in the forward / reverse mode by operating the switch and pulling the trigger when the switching dial is in the rotation mode.
  • an impact mode in which only the impact force is transmitted to the tip tool by the reciprocating motion conversion unit a rotation mode in which only the rotational force is transmitted to the tip tool by the rotational motion transmission unit, and the impact force to the tip tool It is preferable to further have a switching dial for switching between a rotation impact mode for transmitting the rotational force and a forward / reverse mode.
  • the operator can easily set the forward / reverse mode by switching the switching dial.
  • the housing has a main body portion that accommodates the motor and the rotational movement transmitting portion, and a handle portion that is movable with respect to the main body portion, and the drilling tool detects the movement of the handle portion. It is preferable to include a detection unit that performs and a control unit that sets the operation mode to the forward / reverse mode based on the detection result of the detection unit.
  • control unit since the control unit sets the operation mode to the forward / reverse mode when the handle unit moves with respect to the main body unit, the operator detects an operation of pulling out the tip tool from the processing member. , Can automatically set to forward and reverse mode.
  • this detection part is a load sensor.
  • the detection unit is a load sensor, the movement of the handle unit can be reliably detected.
  • this detection part is a position sensor.
  • the detection unit is a position sensor, the movement of the handle unit can be reliably detected.
  • the motor is preferably a brushless motor.
  • the drilling tool which can pull out a front-end tool from a process member easily can be provided.
  • Sectional drawing of the hammer drill of the 1st Embodiment of this invention Sectional drawing along II-II of FIG. 1 of the hammer drill of the 1st Embodiment of this invention.
  • the plane sectional view in case the change dial of the hammer drill of the 1st embodiment of the present invention is in rotation mode.
  • the plane sectional view in case the change dial of the hammer drill of the 1st embodiment of the present invention is in hitting mode.
  • the plane sectional view in case the change dial of the hammer drill of the 1st embodiment of the present invention is in the rotation impact mode.
  • FIG. 1 is a cross-sectional view of a hammer drill 1 which is a typical drilling tool, and mainly includes a housing 2, a brushless motor 3, a motion conversion mechanism 4, and an output unit 5.
  • the side on which the output unit 5 is provided with respect to the motion conversion mechanism 4 is defined as the front side, and the opposite is defined as the rear side.
  • the side on which the motor 3 is provided with respect to the motion conversion mechanism 4 is defined as the lower side, and the opposite is defined as the upper side.
  • the right side of the hammer drill 1 when viewed from the rear side in FIG. 1 is defined as the right side, and the opposite side is defined as the left side.
  • the housing 2 includes a motor housing 21, a main body portion 22, and a handle portion 23 connected to the motor housing 21 and the main body portion 22.
  • the motor housing 21 extends downward from the main body 22 and houses the brushless motor 3.
  • the main body portion 22 accommodates the motion conversion mechanism 4 and is connected to the handle portion 23 at the rear upper end.
  • a switching dial 24 for switching the operation mode of the hammer drill 1 is provided on the left side surface of the main body 22 so as to be rotatable with respect to the main body 22 (FIG. 4). The operator can switch the operation mode of the hammer drill 1 between the rotation mode, the batting mode, the rotation batting mode, and the neutral mode by switching the switching dial 24.
  • the switching dial 24 is provided with a mode position sensor 26 (FIG.
  • the switching dial 24 includes a first pressing portion 24 ⁇ / b> A and a second pressing portion 24 ⁇ / b> B that protrude inward of the housing 2. Detailed operations in each mode will be described later. *
  • a power cable 11 is attached to the handle portion 23 and a switch mechanism 12 is built therein.
  • a trigger 13 that can be operated by a user is mechanically connected to the switch mechanism 12.
  • the power cable 11 can connect the switch mechanism to an external power source (not shown).
  • an external power source not shown
  • the connection and disconnection between the brushless motor 3 and the external power source can be switched.
  • a rotation direction changeover switch 14 that sets the rotation direction of the brushless motor 3 and a forward / reverse mode setting that is located behind the rotation direction changeover switch 14 and sets the operation mode of the hammer drill 1 to the forward / reverse mode.
  • a switch 15 is provided.
  • the brushless motor 3 includes an output shaft 31 that extends in the vertical direction and outputs a rotational driving force.
  • a rotor 32 having a permanent magnet 32 ⁇ / b> A (FIG. 3) is coaxially fixed to the output shaft 31.
  • a stator 33 having a plurality of coils 33 ⁇ / b> A facing the rotor 32 is disposed outside the rotor 32 in the radial direction.
  • an inverter circuit 34 including a plurality of FETs 34A and a hall element 34B is provided below the rotor 32 and the stator 33.
  • a plurality of FETs 34A are provided on the lower surface of the inverter circuit 34 (FIG. 3).
  • the hall element 34B is provided on the upper surface of the inverter circuit 34 at a position facing the permanent magnet 32A in the vertical direction.
  • a pinion gear 31 ⁇ / b> A is provided at the tip of the output shaft 31 and meshes with the motion conversion mechanism 4.
  • a full-wave rectifier circuit 35 and a control board 36 are accommodated in a connection portion between the handle portion 23 and the motor housing 21 behind the brushless motor 3.
  • the full wave rectification circuit 35 is a circuit for full wave rectification of alternating current from the power cable 11 to direct current, and is electrically connected to the control board 36 and the inverter circuit 34. Detailed configurations of the full-wave rectifier circuit 35 and the control board 36 will be described later.
  • the control board 36 corresponds to the control unit of the present invention. *
  • the motion conversion mechanism 4 mainly includes a first gear 41, a crankshaft 42, a crank weight 43, a crankpin 44, a connecting rod 45, and a rotation transmission unit 6.
  • the first gear 41 meshes with the pinion gear 31 ⁇ / b> A and is coaxially fixed to the crankshaft 42.
  • the crankshaft 42 is disposed so as to extend in the vertical direction behind the output shaft 31 and is rotatably supported by the main body 22.
  • the crank weight 43 is fixed to the upper end of the crankshaft 42.
  • the crank pin 44 extends upward from the crank weight 43 and is fixed to the end thereof.
  • a crank pin 44 is inserted at the rear end of the connecting rod 45.
  • crankshaft 42, the crank weight 43, and the crankpin 44 are formed by machining from an integral part. However, some parts (for example, the crank pin 44) may be combined after being lowered separately.
  • the motion conversion mechanism 4 corresponds to the speed reduction unit of the present invention.
  • a substantially cylindrical cylinder 51 extending in a direction (front-rear direction) orthogonal to the output shaft 31 is provided in the main body 22.
  • the cylinder 51 is formed with a plurality of first breathing holes 51a arranged in the circumferential direction and a plurality of second breathing holes 51b positioned in front of the plurality of first breathing holes 51a.
  • a piston 52 that can slide in the front-rear direction is provided in the cylinder 51.
  • the piston 52 has a piston pin 52 ⁇ / b> A, and the piston pin 52 ⁇ / b> A is inserted at the tip of the connecting rod 45.
  • a striker 53 is provided on the inner periphery of the cylinder 51 so as to be slidable (reciprocating) on the tip side in the cylinder 51.
  • An air chamber 54 is defined in the cylinder 51 and between the piston 52 and the striker 53.
  • An intermediate element 55 that is struck by the striker 53 and transmits the strike to the tip tool 7 is provided in front of the striker 53.
  • the radial direction, the circumferential direction, and the axial direction refer to directions with respect to the cylinder 51.
  • the piston 52, the striker 53, and the intermediate element 55 correspond to the reciprocating member of the present invention. *
  • the rotation transmission unit 6 includes a second gear 61, a rotation transmission shaft 62, a bevel gear 63, and a clutch 64.
  • the second gear 61 is disposed on the opposite side of the first gear 41 with respect to the output shaft 31, and meshes with the pinion gear 31A.
  • the second gear 61 is coaxially fixed to the rotation transmission shaft 62.
  • the rotation transmission shaft 62 is disposed in front of the output shaft 31 so as to extend in the vertical direction, and is rotatably supported by the main body 22.
  • a gear portion 62 ⁇ / b> A that meshes with the bevel gear 63 is provided at the distal end portion of the rotation transmission shaft 62.
  • the rotation from the brushless motor 3 is transmitted to the bevel gear 63 via the second gear 61 and the gear portion 62A, whereby the rotation speed of the brushless motor 3 is reduced. That is, the bevel gear 63 is a final reduction unit in which the rotation number of the brushless motor 3 is reduced most in the rotation transmission unit 6.
  • the bevel gear 63 corresponds to the rotating member of the present invention. In the present embodiment, the gear ratio is set such that approximately five hits are performed during one rotation of the tip tool 7.
  • the bevel gear 63 is provided at the rear portion of the cylinder 51 so as to cover the outer periphery of the cylinder 51.
  • the bevel gear 63 is supported on the cylinder 51 so as to be rotatable relative to the cylinder 51.
  • the bevel gear 63 is formed with a plurality of recesses 63a that are recessed outward in the radial direction, and a plurality of contact portions 63A that protrude inward are defined between the recesses 63a. ing.
  • the distance in the circumferential direction of the contact portion 63A is shorter than the distance in the circumferential direction of the recess 63a.
  • the six contact portions 63A are equally arranged in the circumferential direction every about 60 °.
  • the contact portion 63A can contact a contacted portion 64A described later. *
  • the clutch 64 rotates integrally with the cylinder 51 and is provided in front of the bevel gear 63 so as to be movable in the front-rear direction. As shown in FIG. 4, the clutch 64 is biased rearward by the first spring 56. The rear end portion of the clutch 64 can be in contact with the contact portion 63A and is provided with a plurality of contacted portions 64A (FIG. 2). The plurality of abutted portions 64A are equally arranged in the circumferential direction every about 60 ° so as to correspond to the six abutting portions 63A. The contacted portion 64A protrudes radially outward, and the protrusion amount and the protrusion amount of the contact portion 63A inward in the radial direction are substantially the same.
  • the circumferential length of the contacted portion 64A is longer than the circumferential length of the contacting portion 63A.
  • the plurality of contact portions 63A and the plurality of contacted portions 64A are all in contact with each other at the same time.
  • the contact portion 63A and the contacted portion 64A constitute a so-called rotation backlash, and the rotation of the brushless motor 3 is transmitted to the cylinder 51 through the rotation backlash.
  • a receiving portion 64 a that is recessed inward in the radial direction and that can receive a moving member 65 described later is formed at the rear portion of the clutch 64. *
  • a substantially cylindrical moving member 65 is provided in front of the clutch 64 so as to cover the outer periphery of the cylinder 51.
  • the moving member 65 is movable in the axial direction and is urged rearward by the second spring 57. As the moving member 65 moves in the front-rear direction, the rear end portion of the moving member 65 opens and closes the first breathing hole 51a (FIGS. 5 and 6). *
  • the output part 5 is arrange
  • the brushless motor 3 is a three-phase brushless DC motor.
  • the permanent magnet 32A of the rotor 32 includes a plurality of sets (two sets in this embodiment) of N poles and S poles, and the coil 33A includes three-phase coils U, V, and W that are star-connected.
  • the energization direction and time of the coils U, V, and W are controlled based on the position detection signal from the hall element 34B arranged to face the permanent magnet 32A.
  • the FET 34A is composed of six switching elements Q1 to Q6 connected in a three-phase bridge format.
  • the gates of the six switching elements Q1 to Q6 that are bridge-connected are connected to the control signal output circuit 71, and the drains or sources of the six switching elements Q1 to Q6 are connected to the star-connected coils U, V , W.
  • the six switching elements Q1 to Q6 perform the switching operation by the switching element drive signals (drive signals such as H4, H5, H6, etc.) input from the control signal output circuit 71, and the full-wave rectifier circuit 35 Electric power is supplied to the stator windings U, V, and W as three-phase (U-phase, V-phase, and W-phase) voltages Vu, Vv, and Vw using the rectified DC voltage.
  • the switching element drive signals drive signals such as H4, H5, H6, etc.
  • switching element drive signals three-phase signals
  • three negative power supply side switching elements Q4, Q5, and Q6 are converted to pulse width modulation signals (PWM signals) H4.
  • PWM signals pulse width modulation signals
  • the brushless motor 3 is supplied as H5 and H6, and the pulse width (duty ratio) of the PWM signal is changed based on the detection signal of the operation amount (stroke) of the trigger 13 by the calculation unit 72 provided in the control board 36.
  • the power supply amount to the motor is adjusted, and the start / stop of the brushless motor 3 and the rotation speed are controlled.
  • the PWM signal is supplied to any one of the positive power supply side switching elements Q1 to Q3 or the negative power supply side switching elements Q4 to Q6 of the substrate 35, and the switching elements Q1 to Q3 or the switching elements Q4 to Q6 are switched at high speed.
  • the power supplied to the coils U, V, W from the DC voltage of the full-wave rectifier circuit 35 is controlled.
  • the control board 36 includes a control signal output circuit 71, a calculation unit 72, a current detection circuit 73, a voltage detection circuit 74, a switch operation detection circuit 75, a rotation position detection circuit 76, a rotation speed detection circuit 77,
  • the calculation unit 72 is a central processing unit (CPU) for outputting a drive signal based on the processing program and data, a ROM for storing the processing program, control data, various threshold values, and the like, And a RAM for temporarily storing data.
  • CPU central processing unit
  • the computing unit 72 forms a drive signal for alternately switching predetermined switching elements Q1 to Q6 based on the output signal of the rotational position detection circuit 76, and outputs the control signal to the control signal output circuit 71.
  • the predetermined windings of the coils U, V, and W are alternately energized, and the rotor 32 is rotated in the set rotation direction.
  • the drive signal applied to the negative power supply side switching elements Q4 to Q6 is output as a PWM modulation signal based on the output control signal of the switch operation detection circuit 75.
  • the current value and the voltage value supplied to the brushless motor 3 are measured by the current detection circuit 73 and the voltage detection circuit 74, and the values are fed back to the calculation unit 72 so that the set drive power and current are obtained. Adjusted to The PWM signal may be applied to the positive power supply side switching elements Q1 to Q3. *
  • the switch operation detection circuit 75 outputs a control signal to the calculation unit 72 based on the operation of the trigger 13. Further, signals from the forward / reverse mode setting switch 15 and the mode position sensor 26 are detected and output to the calculation unit 72.
  • the brushless motor 3 is driven in the forward / reverse mode only when the mode position sensor 26 detects that the switching dial 24 is in the rotation mode and the forward / reverse mode setting switch 15 is operated. In the forward / reverse mode, 40 msec forward rotation, 10 msec stop, 40 msec reverse rotation, and 10 msec stop are repeated.
  • the forward rotation time, the stop time, and the reverse rotation time are not limited to this, and can be set to optimum values according to the structure of the rotation play, the rotation speed of the brushless motor 3, and the like. *
  • the computing unit 72 detects the rotational speed of the brushless motor 3 based on the signal from the rotational position detection circuit 76 and the signal from the rotational speed detection circuit 77.
  • the hammer drill 1 of the present embodiment can be switched between a rotation mode, a batting mode, a rotation batting mode, and a neutral mode by operating the switching dial 24.
  • FIG. 4 shows a state when the switching dial 24 is in the rotation mode. In the rotation mode, only the rotation of the cylinder 51 is transmitted to the tip tool 7. Specifically, the clutch 64 and the bevel gear 63 are engaged with each other via a rotation play. At this time, the second pressing portion 24B presses the moving member 65 against the urging force of the second spring 57, and the moving member 65 moves backward. As a result, the first breathing hole 51a is opened.
  • the brushless motor 3 rotates, and the rotational force is transmitted to the cylinder 51 via the rotation transmission unit 6. Specifically, the rotational driving force of the brushless motor 3 is transmitted to the pinion gear 31 ⁇ / b> A, the second gear 61, and the rotation transmission shaft 62. The rotation of the rotation transmission shaft 62 is transmitted to the gear portion 62 ⁇ / b> A and the bevel gear 63. Further, the contact portion 63 ⁇ / b> A of the bevel gear 63 and the contacted portion 64 ⁇ / b> A contact each other, and the rotation of the bevel gear 63 is transmitted to the clutch 64 and the cylinder 51. A rotational force is applied to the tip tool 7 by the rotation of the cylinder 51. In the air chamber 54, since the first breathing hole 51 a is opened, the reciprocating motion of the piston 52 is not transmitted to the striker 53. *
  • FIG. 5 shows a state when the switching dial 24 is in the impact mode.
  • the first pressing portion 24 ⁇ / b> A presses the clutch 64 backward against the urging force of the first spring 56.
  • the moving member 65 moves forward by the biasing force of the second spring 57, and closes the first breathing hole 51a.
  • crankshaft 42 When the trigger 13 is pulled to rotate the brushless motor 3, this rotational force is transmitted to the crankshaft 42 via the pinion gear 31 ⁇ / b> A and the first gear 41.
  • the rotation of the crankshaft 42 is converted into a reciprocating motion of the piston 52 in the cylinder 51 by the motion conversion mechanism 4 (crank weight 43, crankpin 44, and connecting rod 45).
  • FIG. 6 shows a state when the switching dial 24 is in the rotation hitting mode.
  • the impact force due to the reciprocating motion of the piston 52 and the rotation of the cylinder 51 are transmitted to the tip tool 7.
  • the clutch 64 is moved forward by the urging force of the first spring 56, and the bevel gear 63 and the clutch 64 are engaged with each other through the rotation play.
  • the moving member 65 moves forward by the urging force of the second spring 57 and closes the first breathing hole 51a.
  • the neutral mode is a mode for freely setting the rotational position of the tip tool 7. For example, when a scoop or the like is used for the tip tool 7, the operator can fix the scoop at an arbitrary rotational position.
  • the tip tool 7 may engage with a reinforcing bar or the like in the concrete to be temporarily locked (galling). In this case, the tip tool 7 needs to be pulled out from the concrete once, but is not easily pulled out by galling. This galling also occurs when the tip tool 7 is pulled out from the hole.
  • the operator sets the switching dial 24 to the rotation mode (FIG. 4) and pulls the trigger 13 with the forward / reverse mode setting switch 15 set to the forward / reverse mode, thereby operating the hammer drill 1 in the forward / reverse mode. be able to.
  • the brushless motor 3 repeats forward rotation, stop, and reverse rotation in a short time.
  • the state changes from FIG. 2A to FIG. 2C during 40 msec of normal rotation, and the contact part 63A strikes the contacted part 64A, and the tip tool 7 is hit. It is transmitted as a rotational force in the forward direction.
  • the 40 msec brushless motor 3 rotates in the reverse direction, and the state shown in FIG. 2 (a) is changed again from FIG. 2 (c), and the rotational force in the reverse direction is transmitted to the tip tool 7.
  • the tip tool 7 is slightly forward / reversely rotated at regular intervals, so that the locked state of the tip tool 7 can be easily released.
  • the range in which the contact portion 63A rotates forward and backward is approximately 60 °, and the amount of rotation of the crankshaft 42 during the forward and reverse movement is less than one rotation.
  • the operator sets the switching dial 24 to the rotation impact mode as shown in FIG. 6 (S1), and sets the rotation direction selector switch 14 to the normal rotation direction (S2). Thereby, the drilling work preparation of the hammer drill 1 is completed.
  • the tip tool 7 is pressed against the processing member to seal the air chamber 54, and the trigger 13 is pulled (S3: YES), whereby the brushless motor 3 is rotated forward (S4).
  • S5: NO the brushless motor 3 continues normal rotation (S4).
  • the tip tool 7 and the machining member are locked (S5: YES)
  • the operator releases the trigger 13 (S6: YES). *
  • the switching dial 24 is set to the rotation mode (S9), and the forward / reverse mode setting switch 15 is turned on (S10). .
  • the brushless motor 3 operates to repeat normal rotation and reverse rotation in a short time (S12). After the tip tool 7 is pulled out from the workpiece, the work is ended by releasing the trigger 13 (S13: YES).
  • the tip tool 7 repeats in the forward direction and the reverse direction. Therefore, even if the tip tool 7 and the machining member are temporarily locked (caulking) The tool 7 can be easily pulled out from the workpiece. Thereby, workability
  • the tip tool 7 and the machining member are temporarily locked. Even if the brushless motor 3 is driven in the forward / reverse mode, the hammer drill 1 is not swung around the tip tool 7. That is, since the tip tool 7 is in the locked state, even if the rotation of the brushless motor 3 bounces back as a reaction force on the entire hammer drill 1, there is a rotation play between the brushless motor 3 and the tip tool 7. The reaction force can be reduced by the rotation play. Thereby, the front-end tool 7 can be easily pulled out from the processing member, and workability can be improved. Further, when the contact portion 63A strikes the contacted portion 64A, a strong rotational force is temporarily transmitted to the tip tool 7, and the locked state can be released at an early stage.
  • a sensor 115 is provided instead of the forward / reverse mode setting switch 15.
  • the handle part 123 provided in the housing 2 is movable with respect to the main body part 22. Specifically, the handle portion 123 rotates about a connection portion with the motor housing 21 (portion in which the control board 36 is accommodated) approximately. As a result, the handle portion 123 and the main body portion 22 approach and separate from each other in the front-rear direction.
  • the sensor 115 is a position sensor for detecting the position of the handle portion 123, and is electrically connected to the switch mechanism 12 and the control board 36.
  • the sensor 115 corresponds to the detection unit of the present invention.
  • the handle portion 123 and the main body portion 22 are close to each other.
  • the operator returns the trigger 13 and pulls the handle portion 123 backward in order to pull out the tip tool 7 from the processing member.
  • the handle portion 123 is separated from the main body portion 22 (the handle portion 123 is rotated).
  • the sensor 115 detects that the handle portion 123 is separated and automatically sets the forward / reverse mode.
  • the brushless motor 3 operates in the forward / reverse mode.
  • the sensor 115 may use a load sensor.
  • the hammer drill 101 can operate in the forward / reverse mode regardless of the setting mode of the switching dial 24.
  • control board 36 sets the operation mode to the forward / reverse mode when the handle portion 123 moves with respect to the main body portion 22, the operator tries to pull out the tip tool 7 from the processing member. Can be automatically set to the forward / reverse mode.
  • the sensor 115 is a position sensor, the movement of the handle portion 123 can be reliably detected.
  • a switching dial 224 is provided on the right side surface of the main body 22.
  • the switching dial 224 is provided with an arrow 224A, and the operation mode of the hammer drill 201 can be set by matching the arrow 224A with each mode.
  • a normal / reverse mode D is provided in addition to the normal rotation mode R, neutral mode N, hitting mode S, and rotary hitting mode SR.
  • the operator can set the hammer drill 201 to the forward / reverse mode by setting the arrow 224A to the forward / reverse mode D.
  • the hitting operation is not performed, and the brushless motor 3 repeats forward rotation, stop, and reverse rotation.
  • the drilling tool of this invention is not limited to embodiment mentioned above, A various deformation
  • the brushless motor 3 as shown in FIG. 3 is adopted.
  • a commutator motor having an H bridge circuit as shown in FIG. 10 may be used. Based on the signal from the control signal output circuit 71, the commutator motor can be rotated in both directions by switching the four FETs 234A. *
  • the brushless motor 3 operates as forward rotation, reverse rotation, forward rotation, and reverse rotation, but is not limited to this, and operates so that forward rotation and reverse rotation are repeatedly performed. May be.
  • normal rotation, normal rotation, reverse rotation, and reverse rotation may be used, and normal rotation, normal rotation, reverse rotation, normal rotation, normal rotation, and reverse rotation may be used.
  • contact portions 63A are positioned at every about 60 °, but the present invention is not limited to this. It suffices that at least two contact portions 63A are arranged. However, it is desirable that they are arranged evenly in the circumferential direction. *
  • the switch operation detection constant circuit 75 drives the brushless motor 3 in the forward / reverse mode when the forward / reverse mode setting switch 15 is operated only when the mode position sensor 26 is in the rotation mode.
  • the forward / reverse mode setting switch 15 may be operable only when the mode position sensor 26 is in the rotation mode.
  • the so-called rotation backlash is provided between the bevel gear 63 and the clutch 64, but may be provided between the clutch 64 and the cylinder 51, for example.
  • the clutch 64 is provided with a member corresponding to the contact portion
  • the cylinder 51 is provided with a member corresponding to the contacted portion.
PCT/JP2014/069710 2013-08-30 2014-07-25 穿孔工具 WO2015029660A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US14/915,388 US20160207187A1 (en) 2013-08-30 2014-07-25 Drilling Device
EP14839316.8A EP3040164A4 (de) 2013-08-30 2014-07-25 Bohrwerkzeug
JP2015534092A JPWO2015029660A1 (ja) 2013-08-30 2014-07-25 穿孔工具
CN201480041729.1A CN105408067A (zh) 2013-08-30 2014-07-25 钻孔工具

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013178933 2013-08-30
JP2013-178933 2013-08-30

Publications (1)

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WO2015029660A1 true WO2015029660A1 (ja) 2015-03-05

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EP (1) EP3040164A4 (de)
JP (1) JPWO2015029660A1 (de)
CN (1) CN105408067A (de)
WO (1) WO2015029660A1 (de)

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CN106041833A (zh) * 2015-04-07 2016-10-26 株式会社牧田 冲击工具
JP2017042888A (ja) * 2015-08-27 2017-03-02 株式会社マキタ 打撃工具
JP2020040199A (ja) * 2018-09-10 2020-03-19 株式会社マキタ 打撃工具
WO2022014299A1 (ja) 2020-07-15 2022-01-20 工機ホールディングス株式会社 作業機及び穿孔方法
US11904449B2 (en) 2018-09-10 2024-02-20 Makita Corporation Work tool

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JP2022188996A (ja) * 2021-06-10 2022-12-22 株式会社マキタ 回転打撃工具

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JP2016198829A (ja) * 2015-04-07 2016-12-01 株式会社マキタ 打撃工具
JP2017042888A (ja) * 2015-08-27 2017-03-02 株式会社マキタ 打撃工具
JP2020040199A (ja) * 2018-09-10 2020-03-19 株式会社マキタ 打撃工具
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US11904449B2 (en) 2018-09-10 2024-02-20 Makita Corporation Work tool
WO2022014299A1 (ja) 2020-07-15 2022-01-20 工機ホールディングス株式会社 作業機及び穿孔方法

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EP3040164A1 (de) 2016-07-06
JPWO2015029660A1 (ja) 2017-03-02
EP3040164A4 (de) 2017-04-05
CN105408067A (zh) 2016-03-16
US20160207187A1 (en) 2016-07-21

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